Ask question

Ask question

All categories

8_murik_8 [283]

3 years ago

11

Which two cellular structures have a role in protecting cells from the enviroment

2 answers:

qaws [65]3 years ago

4 0

The nucleus and ribosomes help protect cells from the environment.

Anna [14]3 years ago

3 0

The cell membrane and cell wall for plants animal cells don't have cell walls

You might be interested in

Which class of organic compounds contains nitrogen

Nady [450]

Amine is the class of organic compounds that contains nitrogen

I hope this helps!

8 0

3 years ago

Read 2 more answers

How many cups of beer are in a keg?

Alinara [238K]

The answer is roughly 165 cups of beer.

5 0

3 years ago

Technetium (Tc; Z = 43) is a synthetic element used as a radioactive tracer in medical studies. A Tc atom emits a beta particle

Sedaia [141]

Question in incomplete, complete question is:

Technetium (Tc; Z = 43) is a synthetic element used as a radioactive tracer in medical studies. A Tc atom emits a beta particle (electron) with a kinetic energy (Ek) of $4.71\times 10^{-15}J$ . What is the de Broglie wavelength of this electron (Ek = ½mv²)?

Answer:

$6.762\times 10^{-12} m$ is the de Broglie wavelength of this electron.

Explanation:

To calculate the wavelength of a particle, we use the equation given by De-Broglie's wavelength, which is:

$\lambda=\frac{h}{\sqrt{2mE_k}}$

where,

= De-Broglie's wavelength = ?

h = Planck's constant = $6.624\times 10^{-34}Js$

m = mass of beta particle = $9.1094\times 10^{-31} kg$

$E_k$ = kinetic energy of the particle = $4.71\times 10^{-15}J$

Putting values in above equation, we get:

$\lambda =\frac{6.624\times 10^{-34}Js}{\sqrt{2\times 9.1094\times 10^{-31} kg\times 4.71\times 10^{-15}J}}$

$\lambda = 6.762\times 10^{-12} m$

$6.762\times 10^{-12} m$ is the de Broglie wavelength of this electron.

3 0

3 years ago

4Al(s) + 30₂(g) → 2Al2O3 (s)

Margaret [11]

1) 1 molecules
2) 2 oxygen atoms
3)2 moles of Al2O3 are formed
4)4:3

6 0

2 years ago

What is the mass of 2.15 moles of calcium hydroxide, Ca(OH)2?

ch4aika [34]

159.3 g

mol= mass (g)/ molecular weight (g/mol)

3 0

3 years ago